The code for land development is administered by fairfax county s department of land development services.
Fairfax county attic insulation code.
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4 use r 10 when applied continuously against the wall.
For example cellulose attic insulation has an r value of r 3 7 per inch.
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The term habitable attic is relatively new to the residential code.
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The codes regulating site development are generated from federal state and county laws regulations resolutions and policies as well as specific standards from the virginia department of transportation.
For any thickness the total r value equals the rated r per inch multiplied by the thickness in inches.
Amendments additional state code information.
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The r value of an insulation material is usually listed in terms of r per inch.
Use r 13 when applied between studs or furring strips.
2015 r202 r301 5 blocking between the trusses when using a roof design incorporating a raised roof rafter or truss heel blocking is required.
3 use r 8 when insulation is applied to the exterior.
Attic habitable it appears that this design meets the definition of attic habitable.
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Use r 13 when insulation is applied on the interior.
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Please illustrate or otherwise provide information to show compliance with applicable code requirements.
Table r402 1 2 change cz4 ceiling insulation levels to r 38 and cz4 wood frame wall requirement to r 15 or r 13 r 1.
Table r402 1 4 change cz4 ceiling insulation levels to u 0 030 and cz4 wood frame wall requirement to u 0 079.
A 6 inch thick installation will therefore have a total r value of r 22 2 6 inches x 3.
A finished or unfinished attic that has all the makings of a living space is a habitable attic.
5 insulation must extend from the slab edge to a length of 24 inches vertically and or horizontally.
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